Weft yarn stop motion



Dec. 12, 1961 Filed July 14, 1960 R. A. DUPRE WEFT YARN STOP MOTION 5Sheets-Sheet 1 INVENTOR.

up/'e ATTORNEYS 190 /ana/ U4.

Dec. 12, 1961 R, A, DUPRE wEFT YARN ySTOP MOTION 5 Sheets-Sheet 2 FiledJuly 14, 1960 INVENTOR. ROLAND A. DUPRE Maf fm ATTORNEYS Dec. 12, 1961R. A. DUPRE 3,012,588

wEFT YARN s'roP Mo'rIoN Filed July 14, 1960 5 Sheets-Sheet 3 www@ FIGS

F I G. 8

i INVENTOR- ROLAND A. DUPRE BY -wwyw' ATTORNEYS Dec. 12, 1961 Filed July14, 1960 R. IA. DUPRE WEFT YARN STOP MOTION 5 Sheets-Sheet 4 ATTORNEYSDec. 1,2, 196.1 R. A. DUPRE 3,012,588

WEFT YARN STOP MoTIoN4 Filed July 14, 1960 5 Sheets-Sheet 5 INVENTOR. YROLAND A. DUPRE ATTO R N EYS United States Patent 3,012,588 WEFT YARNSTOP MOTION Roland A. Dupre, Ashton, RJ. (27 Kent St., Cumberland, RJ.)Filed July 14, 1960, Ser. No. 42,867 3 Claims. (Cl. 139-371) Thisinvention relates to an electrical stop motion for a narrow fabric loomand is utilized in conjunction with the stop motion shown in my`co-pending application, Serial No. 811,153, filed May 5, 1959, now U.S.Patent No. 2,984,265.

In the mounting of electrical contacts for the stopping of the loom, Ihave found that during certain vibrations of the loom that thesecontacts have engaged each other when free of the shuttle and causedstopping of the loom when the weft yarn supply in the shuttle was stilloperable.

One of the objects of this invention is to provide an arrangement sothat the contacts cannot stop the loomv even though through vibrationthe contacts engage when the shuttle is not boxed but still allowingstopping when the weft yarn supply is in some way broken or exhausted.

Another object of the invention is to provide energization to the stopmotion onlyat a time when the shuttles are boxed and under positivecontrol. n

With these and other objects in view, the invention consists of certainnovel features of construction as will be more fully described andparticularly pointed out in the appended claims.

In the accompanying drawings:

FIGURE 1 is a diagrammatic view illustrating a portion of a narrowfabric loom with certain wiring for a stop motion; l

FIGURE 2 is an elevation partly in section of a fragmental portion on alarger scale as shown in FIGURE 1;

FIGURE 3 is an elevation of two blocks with the shuttles therein and afragmental portion of the lay upon which they are mounted;

FIGURE 4 is a perspective view, with a block and shuttle tipped down andin :an unnatural position, -illustrating the contact means for engagingcontact plates on the shuttle for the electric circuit;

FIGURE 5 is a perspective view of the contact arm partly broken awaywhichv is mounted on the shuttle block;

FIGURE 6 is a perspective view of a fragmental portion of the loom frameand lay in beat-up position;

FIGURE 7 is an end view of the frame showing the contact mounted uponthe loom frame;

FIGURE 8 is an end view of the frame showing a modified construction ofthe contact;

FIGURE 9 is a plan View of a fragmental portion of a loom showing amodified form of shuttle and modified form of contact means with the layin the back center position to pass the shuttle through the shed;

FIGURE 10 is a view similar to FIGURE 9 but showing the lay in frontcenter or beat-up position;

FIGURE 1l is a sectional View showing the relationship of the lay andframe in beat-up position of the structures of FIGURE 10; and

FIGURE l2 is a perspective view of the shuttle of FIGURES 9 and 10illustrating the electrical contact means therefor and with parts of theshuttle omitted.

In proceeding with the invention, I have arranged to interrupt theelectric circuit which is carried from the loom frame to the lay whichmounts the shuttles except when the lay is in the front center orbeat-up position and the shuttles are boxed. Thus, I have providedcontacts on the frame and either on the lay beam or on the shuttleitself so that when the lay is in beat-up position, the contacts on theframe will be engaged and circuit will Referring to FIGURE 1 in moredetail, 10 designates generally a narrow fabric loom, only that portionof which is shown as is believed necessary for an understanding of thepresent invention. The loom is of known manufacture and has a usualreciprocating lay 11 which carriesH a plurality of spaced shuttle blocks12 in which the shuttles are boxed at the end of each throw thereofacross the warps. Each block has the usual pair of guide tracks 13 and13 for guiding the shuttle 14 from one shuttle block to the other. whichwarps are passed, is positioned in the space between shuttle blocks.

The shuttle blocks are similar to each other and are attached to the lay11 in a known way. In FIGURES 1, 3 and 6 the guide tracks 13, 13' extendon the arc of a circle. The guide tracks 13 extend from one upper sideedge of the block to the lower opposite side edge thereof, and the track13' extends from the upper opposite side edge of the block to the loweropposite side edge thereof. The two tracks v13, 13 intersect each othercentrally of the shuttle block. All the shuttles are moved or oscillatedin unison back and forth between adjacent shuttle blocks. The shuttleswill be moved from the track 13 of one block and into the track v13 ofthe next adjacent shuttle block. At the next throw or movement of theshuttle, the same will be moved from the tracks 13' to initial tracks13. In the form shown in FIGURES 9 to 12 the shuttles move in avstraightline rather than in an arc. It may be here mentioned that during theoscillating of the shuttles, the warps are in a shedded relation and theshuttles pass through the shed and lay a weft across the warps to beinterlaced therewith in a known way, the warps being shedded at eachpass of the shuttles across the warps. The shuttles are oscillated backand forth by means of a gear wheel 16 mounted on each shuttle block forfree rotation and are engaged by a reciprocating toothed rack barindicated generally 17 (see FIGURE l). The shuttles are of knownconstruction each having a body portion 18 and a guide groove 19 (seeFIGURE 4) which interengages with the underout tracks 13, 13 of theshuttle block. Each shuttle is provided with a toothed segment 20 whichis engaged by said gear wheel 16 and oscillated thereby from one shuttleblock to the other.

The loom is provided with the usual shift bar which s an elongated bar21 (FIGS. 1 and 2), which extends longitudinally of the loom and ismanually operable to actuate the loom knock-off mechanism (not shown)to` bring the loom to rest or to actuate the mechanism to start the loomin operation. The knock-olf mechanism is operated through a linkagedesignated generally 22 which is supported on a bracket 23 attached tothe frame 24 of the loom at one end thereof. The bar 21 is pivotallyconnected to said linkage as at 25 and is adapted to rock said linkagein one direction, when the bar is moved,y

towards the right as viewed in FIGURE l, to actuate the knock-offmechanism to start the loom in operation. To"A actuate the mechanism to'stop the loom, the linkage 22 is rocked in the other direction bymoving the bar '2.1

loom knock-0E mechanism. This comprises a suitable support 26 (seeFIGURE 2) which is attached at one of its ends to the loom frame 24 at alocation above the A so-called loom reed 15 throughl In the showing inFIGURES 9 and 10 the contacts occur at only alternate shuttle blockscontacts at each block position being unnecessary.

I claim:

1. In a weft yarn stop motion for a loom comprising a loom frame, areciprocating lay, shuttle blocks carried by the lay with a groove forguiding the shuttles, shuttles in said grooves boxed in said blocks ateach beat-up, electrically actuated means operable upon energization forstopping the loom and including an electric current conducting circuit,said circuit being responsive to failure of the weft yarn for closingthe circuit, said electric circuit having a part in said frame and apart extending along said lay and connected to a plurality of shuttleblocks which engage the shuttles when therein, an independent contactcarried by said frame and a cooperating independent contact carried bysaid lay, said contacts engaging only when beat-up of the lay occurs forclosing the circuit of this location during beat-up while the shuttlesare boxed.

6 2. In a weft yarn stop motion for a loom as in claim l wherein saidcontacts carried by the lay are carried by the lay beam.

3. In a weft yarn stop motion for a loomas in claim 1 wherein one ofsaid contacts is resilient and yields upon engagement at beat-up of thelay.

References Cited in the le of this patent UNITED STATES PATENTS

